"Wolf in the Fold": Y u no Vulcan mind meld?

In the episode "Wolf in the Fold," Scotty is accused of three murders but claims to not remember a single thing. It seems the most [Spock]logical[/Spock] response would have been for Spock to perform a Vulcan mind meld. However, this did not happen.

The writers probably did this to prevent the story from ending in five minutes, but is there any canonical explanation as to why Spock did not do a Vulcan mind meld?

I think that the meld was something Spock preferred not to use unless there was no other choice, because it's very private and intense and all that. Here, they had the psychotricorder and the magic lie-detecting chair to attempt first, so maybe the situation never got to the point where mind-melding was necessary.

Also, Scotty was recovering from a head injury, so maybe the meld would've been too stressful on his healing brain or something.

Me, I'm more inclined to wonder why we never saw psychotricorders again, and why lie-detecting chair technology disappeared after TOS.

But then, a lot of 23rd-century technology seems to have been lost by the 24th, such as seat restraints, security armor, self-heating uniforms ("Spock's Brain"), cures for insanity ("Whom Gods Destroy"), etc.

The Vulcan mind meld started out as a "terrible lowering of personal barriers" and gradually got cheapened, for lack of a better word, as Spock became desensitized.

The same thing can happen with swearing obscenely, being naked in public, you name it: under the right circumstances, people can be re-conditioned and desensitized into doing almost anything as if it were normal behavior.

Regarding Turnabout Intruder and Whom Gods Destroy, those "spot the real captain" situations are frustrating because Spock could end it very easily. He could simply say: "The captain and I had a working breakfast on Tuesday morning. What did you have to eat, and what did Mr. Scott want to talk about?"

Even Spock accepting the defense for the "Cochrane Deceleration" was ridiculous because while it may be a "classic battle maneuver," there was no guarantee Kirk used it. And, IIRC, going by the position of the guy who attacked Spock, it was Kirk who missed the question. Which may have simply been a director error, if I'm not misremembering. Either way, this situation was too easy to resolve realistically.

The Vulcan mind meld started out as a "terrible lowering of personal barriers" and gradually got cheapened, for lack of a better word, as Spock became desensitized.

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They also couldn't settle on a name for it until pretty late in the game. It was "an ancient Vulcan technique," "the Vulcan technique of the joining of two minds," "the Vulcan mind probe," "the Vulcan mind fusion," "the mind touch," "the Mind Meld," which was finally coined in Specter of the Gun, and then "Telepathic communication with the mind of Captain James T. Kirk." I mean, jeez, I guess they used "meld" after the series because it was alliterative and sounded good.

But then, a lot of 23rd-century technology seems to have been lost by the 24th, such as seat restraints, security armor, self-heating uniforms ("Spock's Brain"), cures for insanity ("Whom Gods Destroy"), etc.

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There is precedent for that though. For example in the twentieth century one could fly across the Atlantic at supersonic speeds onboard Concorde, now we have to settle for the slow route. And I believe America once had the ability to put men into space...

This question raises a host of other questions! Would Vulcan mind melds be admissible in court, even in the Federation? If so, what are the standards for admission? Does the meld have to take place after a warrant is properly issued?

Just because they let one kind of "psychic" in doesn't mean they'd let all psychics in. They likely understand their own psychics, but may not believe or understand the Vulcan mind meld. Besides, what else would Spock say? Of course he'd end up saying "Mr. Scott did not commit the murders", because he's a friend and colleague of Scotty. Why should they believe Spock's claim of Scott's innocence? Just because he touched Scotty's face and winced a bit? How are the Argelians to know that something psychic really happened?